/*
 * Copyright (c) 2014-2022 Monix Contributors.
 * See the project homepage at: https://monix.io
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package monix.reactive.internal.operators

import monix.execution.Cancelable
import monix.execution.cancelables.AssignableCancelable
import monix.reactive.Observable
import monix.reactive.observables.ChainedObservable
import monix.reactive.observers.Subscriber

/** Implementation for `Observable.uncancelable`. */
private[reactive] final class UncancelableObservable[A](source: Observable[A]) extends ChainedObservable[A] {

  override def unsafeSubscribeFn(conn: AssignableCancelable.Multi, out: Subscriber[A]): Unit = {
    ChainedObservable.subscribe(source, AssignableCancelable.dummy, out)
  }

  override def unsafeSubscribeFn(out: Subscriber[A]): Cancelable = {
    out.scheduler.executeTrampolined { () => source.unsafeSubscribeFn(out); () }
    Cancelable.empty
  }
}
